TSDemuxer : protect against exception
TSDemuxer : protect against exception

related to https://github.com/mangui/flashls/issues/470

tedconf/flashls,tedconf/flashls,jlacivita/flashls,clappr/flashls,hola/flashls,fixedmachine/flashls,fixedmachine/flashls,neilrackett/flashls,mangui/flashls,vidible/vdb-flashls,jlacivita/flashls,neilrackett/flashls,hola/flashls,clappr/flashls,vidible/vdb-flashls,mangui/flashls